On Monday, 6 November 2017 at 10:12:11 UTC, Jonathan M Davis
wrote:
x ? x : y
and make it
x ?: y
It saves 2 characters plus the length of the variable name.
That's it.
I find I often use this in C# with a more complex expression on
the left-hand side, like a function call. A quick search shows
more than 2/3 of my uses are function calls or otherwise
significantly more complex than a variable. Also, it works great
in conjunction with the null conditional:
foo.Select(a => bar(a, qux)).FirstOrDefault?.Name ?? "not found";
It seems to be targeted primarily at code that does a lot with
classes and is written in such a way that it's not clear
whether a class reference should be null or not, whereas most D
code doesn't do much with classes.
In my C# code, it's used with strings and Nullable<T> more often
than with classes.
Given my own experience with the ?? operator, I'd argue it's
probably not worth it without also including null conditional
(?.). A quick search in a few projects indicate roughly half the
uses of ?? also use ?..
--
Biotronic
